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Human Chromosomes and Genes

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Hmmm, Something's Wrong
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Hmmm, Something's Missing

What's missing? Aren't all chromosomes supposed to be paired?

When A Good Process Goes Wrong

Meiosis is the process whereby the chromosome number of a cell is cut in half on the way to becoming a gamete or sex cell. This is a rather elegant process that allows both mother and father to contribute to the genetic makeup of their offspring without increasing the overall chromosome number of the organism. Imagine what a mess would exist if the chromosome number of organisms increased with each generation! This process is also a way for organisms to increase and maintain genetic diversity which can convey a great advantage to species in our changing environment. https://www.youtube.com/watch?v=eddh-AGV-6c

That's how things work when everything goes right. But like many elegant processes things don't always go right. Here you can find out what happens when things go wrong.

http://www.youtube.com/watch?v=JVq8lcCqY-A

Now that you've heard from the doctors, here's a more personal story about what it's like to have Turner's Syndrome. http://www.youtube.com/watch?v=56ujy218Kag

Extension Investigation

Use the below resources to answer the following questions

  1. What is monosomy?
  2. What happened to the "missing" chromosome in Turner's Syndrome? When did it go missing?
  3. Is it always necessary for a complete chromosome to be missing for someone to have Turner's Syndrome? Explain your answer fully and be specific.
  4. What are two types of gametogenesis? How are they the same? How do they differ? Where do they occur?
  5. What are some of the symptoms of Turner's Syndrome? When do these symptoms appear?
  6. Do all people with Turner's Syndrome have the same symptoms? Why or why not? Explain your answer as fully as you can.
  7. What treatments do doctors use for Turner's Syndrome? How successful are these treatments? Does every person with Turner's Syndrome need treatment?

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